furnace not staying lit

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furnace not staying lit

I am not real familiar with this brand/model of furnace. Do the burners get lit by a hot plate igniter or spark igniter or does a pilot get lit then the burners? Some models of 80% furnaces have an intermediate pilot the flame sensor needs to see before the burners light. If this is the case, make sure the pilot is burning enough to keep the flame in the sensor when the burners come on. If it does not have a pilot is the sensor in the flame when the burners come on? Some background may also be helpfull. Has there been any work done on or near the furnace electricaly?

furnace not staying lit

furnace not staying lit

Take the burners out and clean them too. The flame sensor is only 1/3rd of the flame proving sequence. Clean burner faces for a good return to ground and the circuit board are the others 2/3rds of the mix.